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  Ink cartridge for inkjet printerUSPTO Application #: 20070222840Title: Ink cartridge for inkjet printer Abstract: A valve core of an ink cartridge includes an elastic valve sheet having an inner portion and an outer portion. The outer portion extends outwards from the inner portion and protrudes towards an upstream side of the valve core. The outer portion is adapted to sealingly engage and disengage with a valve seat in which the valve core is mounted. (end of abstract) Agent: Barron & Young Intellectual Property - Kowloon, HK Inventors: Qingguo Xiao, Benyou Jin, Leung Mui Ho, Yonggang He, Yongzhong Tian USPTO Applicaton #: 20070222840 - Class: 347086000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070222840. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCES [0001] The present application claims priorities from Chinese Patent Application No. 200610071376.7 filed Mar. 24, 2006 and Chinese Patent Application No. 200620057250.X filed Mar. 29, 2006. FIELD OF APPLICATION [0002] The present application relates to an ink cartridge for an inkjet printer. BACKGROUND [0003] An ink cartridge for an inkjet printer is used for supplying ink to a recording head provided on the ink cartridge. The conventional ink cartridge utilizes an ink storage chamber which generates pressure. A porous material such a sponge is provided inside the ink storage chamber. An ink supply chamber is in fluid communication with the ink storage chamber by means of openings provided on one side wall thereof. An inkjet port is provided on another side wall of the ink storage cartridge. The ink cartridge, including the ink storage chamber, the ink supply chamber and the inkjet port, is detachably installed on an ink cartridge of the inkjet printer. The ink cartridge is connected to the recording head for supplying ink thereto. In the state in which the inkjet port generates ejecting pressure, ink flows from the inkjet port to the recording head, and then onto a paper. The surface tension of the porous material provided inside the ink storage chamber can prevent the ink from leaking. SUMMARY [0004] This application is directed to an ink cartridge for an inkjet printer. In one aspect, a valve core of an ink cartridge is provided. The valve core includes an elastic valve sheet having an inner portion and an outer portion. The outer portion extends outwards from the inner portion and protrudes towards an upstream side of the valve core. The outer portion is adapted to sealingly engage and disengage with a valve seat in which the valve core is mounted. [0005] In another aspect, a valve assembly of an ink cartridge is provided. The valve assembly includes a valve core and a valve seat. The valve core includes an elastic valve sheet having an inner portion and an outer portion. The outer portion extends outwards from the inner portion and protrudes towards an upstream side of the valve core. The valve seat includes a valve chamber in which the valve sheet of the valve core is disposed. The valve chamber has an inner surface. The outer portion of the valve sheet is adapted to sealingly engage and disengage with the inner surface of the valve chamber. [0006] In another aspect, an ink cartridge is provided. The ink cartridge includes an ink supply chamber adapted to contain ink, an ink supply port adapted to supply the ink to a print head, and a valve assembly positioned between the ink supply chamber and the ink supply port. The valve assembly includes a valve core and a valve seat. The valve core includes an elastic valve sheet having an inner portion and an outer portion. The outer portion extends outwards from the inner portion and protrudes towards an upstream side of the valve core. The valve seat includes a valve chamber in which the valve sheet of the valve core is disposed. The valve chamber has an inner surface. The outer portion of the valve sheet is adapted to sealingly engage and disengage with the inner surface of the valve chamber. BRIEF DESCRIPTION OF THE DRAWINGS [0007] FIG. 1 a is a perspective view of a first embodiment of a valve core of a valve assembly of an ink cartridge. [0008] FIG. 1b is a perspective view of the valve core of FIG. 1a in opposite direction. [0009] FIG. 1c is a sectional view of the valve core of FIG. 1a. [0010] FIG. 2a is a perspective view of a second embodiment of a valve core of a valve assembly of an ink cartridge. [0011] FIG. 2b is a perspective view of the valve core of FIG. 2a in opposite direction. [0012] FIG. 2c is a sectional view of the valve core of FIG. 2a. [0013] FIG. 3a is a perspective view of a third embodiment of a valve core of a valve assembly of an ink cartridge. [0014] FIG. 3b is a perspective view of the valve core of FIG. 3a in opposite direction. [0015] FIG. 3c is a sectional view of the valve core of FIG. 3a. [0016] FIG. 4a is a perspective view of a fourth embodiment of a valve core of a valve assembly of an ink cartridge. [0017] FIG. 4b is a perspective view of the valve core of FIG. 4a in opposite direction. [0018] FIG. 5 is a cross sectional view of a fifth embodiment of a valve core of a valve assembly of an ink cartridge. [0019] FIG. 6 is a cross sectional view of a sixth embodiment of a valve core. Continue reading... Full patent description for Ink cartridge for inkjet printer Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Ink cartridge for inkjet printer patent application. Patent Applications in related categories: 20080106582 - Liquid tank - A liquid tank includes a liquid chamber for holding liquid and an absorption chamber containing an absorber for absorbing and holding the liquid. The liquid chamber and the absorption chamber are separated by a partition. The partition has a communication part allowing communication between the liquid chamber and the absorption ... 20080106581 - Water-based ink, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image forming method - A water-based ink of the present invention comprises water, a plurality of different water-soluble organic solvents, and a water-insoluble coloring material, wherein the above water-soluble organic solvents consist of a good solvent to the above water-insoluble coloring material and a poor solvent to the above water-insoluble coloring material, and the ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. 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